# Count groups of ten and extra ones

I can count more efficiently by grouping objects into tens and then counting the groups of tens and extra ones.

# Count groups of ten and extra ones

I can count more efficiently by grouping objects into tens and then counting the groups of tens and extra ones.

## Lesson details

### Key learning points

- Ten ones are equivalent to one ten.
- When counting larger groups, it is more efficient to group objects into tens, then count the tens and extra ones.
- We can work out how many there are by counting in ones, or by counting the groups of ten and extra ones.

### Common misconception

Children may only think of 'ones' in terms of the extra ones after the tens have been grouped, so may fail to see 45, for example, as 45 ones as well as 4 tens and 5 ones.

When objects are grouped in tens, use deliberate errors and discussion to draw attention to the total number of ones represented by the number, so children are familiar with recognising both the extra ones and the total number of ones in a number.

### Keywords

Digit - A single symbol used to make a numeral.

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Video

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## Starter quiz

### 6 Questions

50

40

80

## Exit quiz

### 6 Questions

56

65

32

23